Optimize test suite: split integration tests, add -short support

- Split slow importer integration tests into separate file
- Add t.Short() guards to 10 slow daemon tests
- Document test organization in TEST_OPTIMIZATION.md
- Fast tests now run in ~50s vs 3+ minutes
- Use 'go test -short ./...' for fast feedback

Amp-Thread-ID: https://ampcode.com/threads/T-29ae21ac-749d-43d7-bf0c-2c5f7a06ae76
Co-authored-by: Amp <amp@ampcode.com>

cmd/bd/cli_fast_test.go

@@ -246,15 +246,26 @@ func TestCLI_Import(t *testing.T) {
 var testBD string
 
 func init() {
-	// Build bd binary once
-	tmpDir, err := os.MkdirTemp("", "bd-cli-test-*")
-	if err != nil {
-		panic(err)
-	}
+	// Use existing bd binary from repo root if available, otherwise build once
 	bdBinary := "bd"
 	if runtime.GOOS == "windows" {
 		bdBinary = "bd.exe"
 	}
+	
+	// Check if bd binary exists in repo root (../../bd from cmd/bd/)
+	repoRoot := filepath.Join("..", "..")
+	existingBD := filepath.Join(repoRoot, bdBinary)
+	if _, err := os.Stat(existingBD); err == nil {
+		// Use existing binary
+		testBD, _ = filepath.Abs(existingBD)
+		return
+	}
+	
+	// Fall back to building once (for CI or fresh checkouts)
+	tmpDir, err := os.MkdirTemp("", "bd-cli-test-*")
+	if err != nil {
+		panic(err)
+	}
 	testBD = filepath.Join(tmpDir, bdBinary)
 	cmd := exec.Command("go", "build", "-o", testBD, ".")
 	if out, err := cmd.CombinedOutput(); err != nil {

cmd/bd/daemon_autoimport_test.go

@@ -1,3 +1,6 @@
+//go:build integration
+// +build integration
+
 package main
 
 import (

cmd/bd/daemon_lock_test.go

@@ -1,3 +1,6 @@
+//go:build integration
+// +build integration
+
 package main
 
 import (

cmd/bd/daemon_sync_branch_test.go

@@ -1,3 +1,6 @@
+//go:build integration
+// +build integration
+
 package main
 
 import (

cmd/bd/daemon_test.go

@@ -1,3 +1,6 @@
+//go:build integration
+// +build integration
+
 package main
 
 import (

cmd/bd/daemon_watcher_platform_test.go

@@ -1,3 +1,6 @@
+//go:build integration
+// +build integration
+
 package main
 
 import (

cmd/bd/daemon_watcher_test.go

@@ -1,3 +1,6 @@
+//go:build integration
+// +build integration
+
 package main
 
 import (

cmd/bd/git_sync_test.go

@@ -1,3 +1,6 @@
+//go:build integration
+// +build integration
+
 package main
 
 import (

cmd/bd/test_helpers_test.go

@@ -9,6 +9,8 @@ import (
 	"github.com/steveyegge/beads/internal/storage/sqlite"
 )
 
+const windowsOS = "windows"
+
 // newTestStore creates a SQLite store with issue_prefix configured (bd-166)
 // This prevents "database not initialized" errors in tests
 func newTestStore(t *testing.T, dbPath string) *sqlite.SQLiteStorage {